When people are not aware of the cues that signal day or night,

A) they experience strong symptoms of jet lag.
B) they sleep twice as much compared to their typical night's sleep.
C) emotional, intellectual, and physical biorhythms become closely synchronized with one another.
D) they roughly have a 25-hour day.

25-Hour Day

A concept referring to the phenomenon where the internal body clock, or circadian rhythm, naturally leans towards a slightly longer cycle than the 24-hour day.

Jet Lag

A temporary sleep disorder resulting from travel across multiple time zones, disrupting the body's internal clock or circadian rhythm.

Night's Sleep

The period of restful unconsciousness and inactivity the body undergoes during the night to recover and rejuvenate.