While insomnia may be the most common sleep disorder, obstructive sleep apnea is the disorder most sleep clinics diagnose and treat. Obstructive sleep apnea is when a person's breathing stops for several seconds during the night due to blockage in the upper respiratory system.

The most important sleep disorders are: Insomnia. Sleep apnea. Restless legs syndrome. Narcolepsy.

Good, healthy sleep means feeling rested upon waking. It means not having chronic bad dreams or nightmares. ... According to a group of French researchers writing in the Journal of Sleep Research, all people dream when they sleep, even people who think they don't.

You spend more of your repeated sleep cycles in stage 2 sleep than in other sleep stages. Stage 3 non- REM sleep is the period of deep sleep that you need to feel refreshed in the morning. ... Most of your dreaming occurs during REM sleep, although some can also occur in non- REM sleep.

The whole brain is active during dreams, from the brain stem to the cortex. Most dreams occur during REM (rapid eye movement) sleep. This is part of the sleep-wake cycle and is controlled by the reticular activating system whose circuits run from the brain stem through the thalamus to the cortex.

How to Control Your Dreams ( While You're Sleeping) ... Lucid dreaming is the ability to know you're dreaming while you're dreaming. A lucid dreamer is able to go to sleep at night, and wake up within his or her dream. Once lucid, you can explore and even change elements of the dream.

" The first dream of the night is about 5 minutes long and the last dream you have before awakening can be 45 minutes to an hour long." It is estimated that most people have more than 100,000 dreams in a lifetime. 5. You can linger in a dream after waking.