American sleep experts designed a test to let volunteers spend 13 consecutive nights in the sleep laboratory and close for 4 nights  Volunteers can sleep for 8 hours every night; For the next 6 days, their sleep time was shortened to 6 hours per night; The last three nights, Zhiying; The volunteers had to sleep for 10 hours a day  The test results showed that after a few days of insufficient sleep, the volunteers' reaction speed slowed down  After sleep, although they felt clear headed, they still acted slowly and clumsily  It can be seen that after working for a week and insufficient sleep, they spent three nights
The sleep time used by volunteers varied, with an average sleep time of 6 hours per night
 Sleep supplement can improve the sleepiness, but it can not improve the cumulative impact of sleep deprivation on cognitive function