Dictionary

theophylline: An anti-asthmatic medication that affects the central nervous system. Theophylline often makes nighttime sleep difficult, especially when people just start the drug.
 
torture: In the past, sleep deprivation has been used as an instrument of torture or as a means of getting people to talk during interrogation situations.

tranylcypromine: An antidepressant drug that has been shown to totally suppress REM sleep when taken at certain doses.

weight gain: Sleep deprivation has been shown to disrupt hormones that regulate glucose metabolism and appetite, causing people to gain weight.

yawn: Typically associated with being tired, a yawn is a reflex that includes deep inhalation and exhalation.