Hello! I think you are basically feeling more sleepy and exhausted during the day rather than the night. The pandemic has done that to many and disrupted routines, working from home as well. You can fix this by being consistent. A few tips I would suggest to you are - get yourself to do any sort of physical activity during the day (even if you are working and have a desk job, take small breaks to stretch, stand, walk around). After work, if you have the time, at least walk for 30 mins minimum, or practice yoga/gym, normal workouts at home. This is much needed. Another important point, check your diet. Try to eat light at night and a little early before going to bed, try and keep lunch light as well (will make you less sleepy), you can do a small snack in the evening, can take a 20-30mins power nap during the day, but make sure you don't cross that time. Reduce caffeine intake to 1-2 cups a day.
It takes at least 66 days for a behaviour/practice to turn into a habit/routine. So try and go to bed by 10.30-11pm, you can indulge in reading something light like a novel until you fall asleep. Be consistent with physical workout, good diet and going to bed early, at least for a month and a half.
Next Steps
If none of this helps, consult a doctor, you can try homeopathy as well.
Health Tips
Let me know if you need any help.