For 35 years the period of phase 4 NREM sleep is only about 6% of total sleep time, only half of what it is 20 Insomnia at night is twice the length and duration Phase 1 of NREM sleep is slightly increased to about 5% of total sleep time. The percentage of REM sleep remained stable at around 22-25% throughout adulthood and early middle, but the density gradually decreases REM.
Avoid circadian changes in individuals over the age of about 45 from adapting as quickly and completely to changes in sleep patterns such as shift work. Other environmental factors such as reduced exposure to light due to domestic employment, reduction of sleep time and medical and psychological disorders affect sleep patterns.
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