When someone stops using tobacco and nicotine products, it can take more than two weeks for the blood level of cotinine to drop to the level that a non-tobacco user would have and several weeks more for the urine level to decrease to a very low concentration.
Pre-school children require 10-13 hours a day. School-age children require 9-11 hours a day. Teenagers need about 8.5-9.5 hours on average. Most adults need 7 to 9 hours a night for the best amount of sleep, although some people may need as few as 6 hours or as many as 10 hours of sleep each day. Women in the first 3 months of pregnancy often need several more hours of sleep than usual.
1. Understand the stages of sleep. There are four stages of sleep, with the fourth and final stage being REM sleep. In order to get more REM sleep, you need to gradually allow your mind and body to go through the first three stages of sleep.Maintaining a regular sleep schedule and healthy sleep habits will help you do this. 1  Stage N1: This is when you are transitioning into sleep and lasts about five minutes.. Understand the stages of sleep. There are four stages of sleep, with the fourth and final stage being REM sleep. In order to get more REM sleep, you need to gradually allow your mind and body to go through the first three stages of sleep.