sleeping pill;  sleep medication
 (one's) sleeping hours;  hours of sleep
 hypnopaedia;  hypnopedia;  sleep-learning
 sleep apnea syndrome;  SAS
 sleep debt;  sleep deficit
 sleeping sickness;  sleeping disease
 short sleeper;  person who doesn't need much sleep
 sleepwalking;  somnambulism
 inactive bank account (no withdrawals or deposits made, and to which the owner's rights have been terminated)