A side-effect of some medications is the inability to fall asleep. Check with your physician or pharmacist if you are taking medications. Psychological problems often disrupt sleep. Depression may cause one to wake early and be unable to fall back to sleep. Anxiety typically interferes with the ability to fall asleep and the mania of a bi-polar disorder prevents one from sleeping at all.
Some people condition themselves to associate bedroom surroundings with insomnia.
If you use the bed to study, eat or read, or if you use sleep time to review personal or academic problems, you may be using the bed as a signal to start worrying instead of sleeping. Chronic use of alcohol, opioid narcotics and other sedatives actually interfere with deep REM sleep. Stimulants, such as cocaine, amphetamines and caffeine activate the brain's arousal mechanism and greatly shorten sleeping time. Establish regular times for sleeping and getting up. Use the bed for sleep and sexual relations only.