at night


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at night

During the night. If I stay out late at night, I'm exhausted for days afterward. Be careful going out in the city at night.
See also: night

at night

during the night. Most people sleep at night. Mary studies at night.
See also: night
References in periodicals archive ?
Second, he says, similar studies could show whether exposure to nocturnal light poses a prostate cancer risk to men, as some researchers suspect, or promotes other cancers previously linked to light at night (SN: 8/28/04, p.
Brainard asked each of a dozen healthy female medical students to give three blood samples, one during the day and two at night.
Carrier personnel, particularly flight deck crews, did not understand why they had to work practically 24 hours a day just to allow a few aviators to fly at night.
Nursing homes are 24-hour-day institutions, so even at night, doors slam, staff members converse, residents scream, carts creak and objects fall clattering to the floor.
There's no relationship between the amount of melatonin you make at night and whether or not you have bad sleep, or whether more melatonin will help you sleep better," says pioneering melatonin researcher Alfred Lewy, director of the Sleep and Mood Disorders Laboratory at the Oregon Health & Science University in Portland.
In addition to the reassuring glare of street lamps, economic and cultural changes were also putting more people on the streets at night in the late nineteenth century.
People are probably designed to sleep 6 or 7 hours at night and take a short afternoon nap, he suggests.
Our follow-up study found that they blunt the normal drop in body temperature at night and suppress the release of melatonin, both of which normally promote sleep," says Murphy.