What does it mean if cant sleep during the night but can day?

There are several possible reasons why a person might be able to sleep during the day but not at night. Some of the most common causes include:

Circadian rhythm disorders: These are conditions that disrupt your body's natural sleep-wake cycle. The most common circadian rhythm disorder is delayed sleep phase syndrome. This condition causes people to feel sleepy in the morning and early afternoon, but awake and alert in the evening and at night.

Stress: Stress can interfere with sleep, making it difficult to fall asleep and stay asleep. Stress can also cause people to wake up early in the morning.

Anxiety: Anxiety disorders, such as generalized anxiety disorder and post-traumatic stress disorder (PTSD), can also lead to sleep problems. People with anxiety may have difficulty falling asleep, staying asleep, or both.

Depression: Depression is a common cause of sleep problems. People with depression may have difficulty falling asleep, staying asleep, or both. They may also wake up early in the morning and feel tired and unrested during the day.

Medical conditions: Certain medical conditions, such as thyroid problems, diabetes, and heart disease, can also lead to sleep problems.