Sleepiness all day and night: First, it may be due to the poor quality of sleep at night, not sleeping well at night, will feel sleepy during the day. Secondly, there may be hypoxia when sleeping at night, that is, the existence of sleep apnea leads to hypoxia at night, which will make you feel sleepy during the day. Thirdly, there may be a combination of some diseases, such as hypothyroidism, which may also be manifested as a lack of motivation, always sleepy and tired all day long, wanting to sleep. There is also a sleep disorder called idiopathic hypersomnia, patients will sleep for a long time, but still feel sleepy, always want to sleep, sleep more than 10 hours every night, there will still be many naps during the day. Fourthly, it depends on whether there is any medication taken recently, such as taking cold medicine or motion sickness medicine because of cold, these medicines will cause people to be sleepy and want to sleep all the time.