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Sleep

Across
An amino acid that aids a body in producing chemicals that cause sleep
A disorder characterized by "sleep attacks" in which a person suddenly falls asleep at various times during the day
A condition in which a person grinds or clenches his or her teeth while sleeping
A cluster of nerve cells in the hypothalamus that controls sleep, body temperature, hormone levels, and brain activity
A type of cell that makes up the body's nerve tissues
People who can function well on less sleep than others
A shortage of sleep that leads to tiredness and to other health problems
A class of sleep disorders in which a person is partially, but not completely, aroused from sleep
A substance that increases the body's activity and makes it difficult to sleep
Down
A disorder in which people experience prickling, tingling, or other irresistible urges to move their legs
Physical, behavioral and mental changes in the body that occur naturally and typically follow the 24-hour cycle of the sun
A serious disorder in which a person stops breathing during sleep
A type of therapy in which a machine is used to open the airways during sleep; a treatment for sleep apnea
A hormone released by the pineal glad that increases feelings of relaxation and tiredness
A condition in which the body is unable to fall asleep or stay asleep
A part of the brain that regulates appetite and energy consumption
The fatigue that people experience after changing time zones during travel