Insomnia or hormonal issue? Specialist?

I’m 39 and have been struggling with sleep for the past 2–3 months. I work throughout the day but don’t usually feel sleepy at night. I end up doomscrolling until around 1 AM and then have to force myself to sleep. I aim to wake at 6 AM but usually wake around 7:30–8 AM, making me late for work. My sleep also doesn’t feel deep or restorative. My periods are regular, with no hot flashes, night sweats, palpitations or significant anxiety. I do have occasional headaches and mostly watery vaginal discharge. I have hypothyroidism and take levothyroxine 100 mcg daily. Could my sleep problem be related to my thyroid levels, perimenopause/hormonal changes, or is it more likely due to my sleep habits and screen use? Should I get my thyroid/hormone levels checked, or consult a gynecologist, physician or sleep specialist?