20-25 minutes is ideal for most people, but it’s important to find the amount that works for you. Try keeping a sleep diary and write down how much you slept each day. Write down when your alarm goes off in the morning, how many times it went off, or any changes in wake up time between days. This will help you determine what time of day works best for your body. If your body likes to go to bed later at night then try going to bed earlier by 10 minutes every few days until eventually getting into a schedule where you are sleeping less than 20 minutes per night!