Is sleeping less than 7 hours insomnia? You cannot simply judge whether a person has insomnia by the amount of time they sleep. So how long do we need to sleep each night to be normal? First of all, the demand for sleep time is different in different stages of human life, such as infants need 24 hours, toddlers 9-12 hours, school children 9-10 hours, adults 7-9 hours, and the elderly 5-6 hours; secondly, the acquisition of sufficient amount of sleep is not entirely determined by the length of sleep, but the key is whether you are refreshed and not sleepy during the day after waking up the next morning. Therefore, sleep quality is more important than sleep time.