There are many reasons as mentioned in the thread.
I had serious apnea and had it treated. Charged a lot of things in my routine diet etc. sleeping improved tremendously. But everyone may have different reasons. I have some deprivation now but that’s due to medical condition and treatment, but I work with the doctor to help me improve my sleep

Always seek medical expert advice.

See a GP discuss your situation.
The GP might refer you to a specialist and the sleep clinic to do testing.
Or suggest afew things to help, diet excersise etc.

.

Sounds like you are on screens. That should be changed. Don’t get over stimulated by tv or games otherwise you will go on for hours. And if you are on screens at work then you not getting the rest your brain and body require.

You need at least 8 hours sleep as an adult.

Set a regular bed time wind down with chamomile tea. Read a book rather than watch tv or play games.
If you have a kindle set it on black background white text at low setting.
Wear a night eye patch can help.
Turn phone off or in sleep mode.

But again, discuss with your GP. You need your sleep as and deprivation affects your daily life .

Take care and sort it out, as your health in general is impacted with lack of sleep.

Walrus