To add to my other reply, our Circadian rythm is based off of the light our eyes are exposed to. The type of light from computer screens, phones, tablets, etc throws off your Circadian rythm. Here is a study out of Harvard
https://www.pnas.org/content/112/4/1232
If you absolutely won't stay away from the laptop/phone/tablet before bed, maybe you could find a filter screen if you use a laptop at night. Not sure they exist but worth looking into. Like I said, some devices have a setting for night time reading.
Also, what temperature do you keep the bedroom at? I don't remember the exact number but I believe 64- 65 degrees is supposed to be the best temp for sleep. Being on the cooler side, is supposed to be the best for sleep. If you like the room to be hot, like 75, maybe decrease the temp by 1 degree every other night so you acclimates to it slowly. Once you get to 64 ( or maybe you can search for the study and find what exact temp they found was best, but I am pretty sure it was 64) try sleeping at that temp for a week so you can really see how it helps. Good luck! Not getting enough sleep sucks.