how many hours of deep sleep should you get a night

Adults typically need between 10% to 20% of their total sleep time to be deep sleep, which amounts to roughly 40 to 110 minutes (about 1 to 2 hours) of deep sleep per night if they get the recommended 7 to 9 hours of total sleep. Most experts suggest aiming for about 1.5 to 2 hours of deep sleep each night for optimal restorative benefits. The amount may vary based on individual factors like age, health, and activity level, but feeling refreshed and alert is a good indication you are getting enough deep sleep.