Definition
The period of darkness during which the sun is sufficiently below the horizon that a person's face cannot be distinguished by natural light. In law, the definition of night has always been contextual and purpose-driven, varying by subject matter, jurisdiction, and era. Two principal legal definitions operate in tension:
1. Common law definition (burglary and criminal law): Night is the period when natural light is so absent that the countenance of a man cannot be discerned. Twilight — whether morning (diluculum) or evening (crepusculum) — is treated as part of the day, not the night, provided sufficient ambient light remains to make out a person's face. This test originates in the common law of burglary, where commission "in the nighttime" was an element of the offense and carried distinct legal consequences.
2. Statutory definition: Many jurisdictions have supplanted the common law test with fixed clock boundaries. In England, statutes fixed the relevant nighttime period for certain offenses at 9 P.M. to 6 A.M. American jurisdictions have adopted various statutory definitions, frequently anchoring nighttime to a specified number of minutes (commonly 30) after sunset and before sunrise, or to fixed hours such as 11 P.M. to 7 A.M., depending on the purpose of the rule (burglary, service of process, search warrants, curfews, liquor licensing, aviation, etc.).
Common Language
Modern common usage (Wiktionary): The time when the sun is below the horizon and the sky is dark; also described astronomically as beginning when the sun is 18 degrees below the horizon. A colloquial legal approximation identifies it as beginning 30 minutes after sunset and ending 30 minutes before sunrise.
Historical common usage (Webster's 1913): That part of the natural day when the sun is beneath the horizon — from sunset to sunrise; especially the period between dusk and dawn when there is no sunlight, only moonlight, starlight, or artificial light.
Editorial note: The common-sense understanding of night tracks sunset and sunrise relatively closely. The legal gap appears at twilight: ordinary usage treats dusk and dawn as transitions into and out of night, while the classical common law treated sufficient ambient twilight as still belonging to the day. A crime committed at dusk — intuitively "nighttime" to most people — could fail to qualify as committed "in the nighttime" under the common law face-discernment test, with potentially significant consequences for charging and sentencing.
Common Confusion
Night versus nighttime: In some statutory schemes the two terms carry distinct meanings. "Night" may refer to the broader natural period from sunset to sunrise, while "nighttime" may be defined by statute to a narrower fixed-hour window for specific legal purposes (e.g., execution of search warrants or service of process). Researchers should not assume the two terms are interchangeable within a given jurisdiction or code.
Common law night versus statutory night: Because the face-discernment test and fixed-hour definitions can yield different results for events occurring during twilight, sources using one definition may be inconsistent with sources using the other. Early American cases applying the common law burglary standard diverge from later cases applying statutory definitions; reading them together without flagging this shift produces error.
Recognized Forms
/SUBTYPES
Nighttime (burglary context): The specific legal period relevant to common law and statutory burglary. Historically an element of the offense; modern criminal codes have treated this differently across jurisdictions, some retaining it as an element and others making it an aggravating factor or eliminating the distinction entirely.
Nighttime service of process: Many procedural rules restrict service of civil process to daytime hours, defining nighttime by fixed clock boundaries. The definition used here is often entirely independent of the criminal law definition.
Nighttime search warrant execution: Constitutional and statutory rules in many jurisdictions require heightened justification for nighttime searches, with "nighttime" again defined by fixed-hour windows that may differ from burglary definitions in the same state.
Why It Matters in Research
Researchers encounter "night" and "nighttime" across at least four distinct legal domains — criminal law (especially burglary), civil procedure (service of process), search and seizure law, and regulatory contexts (curfews, liquor licensing, aviation) — and each domain may apply a different definition. Confirming which definition controls requires locating the governing statute, rule, or common law standard applicable to the specific context, not simply looking up a general definition.
Historical sources are almost uniformly anchored in the burglary context. The face-discernment test that appears in Hale, Blackstone, and all the historical dictionaries in this corpus reflects criminal law doctrine, not a universal definition. Applying that test to interpret a 19th-century case about nighttime service of process or a regulatory matter would be methodologically unsound.
The shift from the common law face-discernment test to fixed statutory hours represents a meaningful doctrinal evolution. Cases decided before a jurisdiction's adoption of fixed-hour definitions must be read against the common law standard; cases decided after must be read against the applicable statute. A corpus search that mixes sources from both periods without flagging this transition will produce unreliable results.
The twilight margin is the most practically significant ambiguity. Events at dusk or dawn fall into genuinely contested territory under the common law test, and historical litigation frequently turned on evidence about the quality of ambient light at the time in question. Researchers examining historical criminal records should treat twilight-hour events as presumptively contested on this point.
Historical Dictionary Support
The historical dictionaries in this corpus converge tightly on the common law definition and its source. All cite Hale's Pleas of the Crown (1 Hale P.C. 350) and Blackstone's Commentaries (4 Bl. Com. 224), and all reproduce the face-discernment test in substantially similar language. Bouvier adds the Latin terms diluculum (morning twilight) and crepusculum (evening twilight), correctly framing both as belonging to the day rather than the night when sufficient light remains. Burrill notes that while "night" in the burglary sense is distinguished from "day" as a separate period, in the general sense the night is considered part of the broader civil or calendar day — a distinction with practical significance for calculating statutory deadlines.
What the historical dictionaries largely omit: They do not address nighttime as a term of art in civil procedure, search warrant law, or regulatory contexts. Anderson's entry wanders into burglary doctrine (breaking and entering, mansion-house) without giving a clean standalone definition of night. Black's notes the English statutory fix of 9 P.M. to 6 A.M. but does not survey American statutory variation, which by the late 19th century was already diverging significantly. Researchers relying solely on these sources will have an accurate account of the common law burglary standard and an incomplete picture of the term's broader legal life.
Jurisdictional Note
American jurisdictions have not standardized the definition. Statutory nighttime for burglary, service of process, and search warrant execution may each carry a different clock-based definition within the same state. Some states retain a modified version of the common law test as a fallback when no statute controls. Researchers working across jurisdictions should locate the specific definitional provision applicable to the offense or procedure at issue rather than importing a definition from another context or jurisdiction.