I have never been a "napper". So my nighttime sleep is not supplemented by daytime Siestas. As with many others, several of my meds have "May cause drowsiness" in their side effects labeling. Those pills I reserve for nighttime administering. That way, they cause drowsiness at the appropriate time. (Bedtime),
"how much do I sleep?" As a rule, shortly after Jay Leno's monologue I turn off the TV and in a few minutes I am deep within "May cause drowsiness" and out for the night. When I awake is often subject to my aches and pains (neck hurts, back hurts, elbows hurt, etc.) but usually between 8:30 AM and 10:00 AM, so I get about eight or nine hours each night. During the day I do not nap.
Luckily (or unluckily) my bedroom TV is limited to "own air digital" because the satellite dish is not connected to the bedroom. I only received network TV or PBS TV, so this prevents me from staying up all night watching movies etc. (probably a good thing). My bedroom TV is also hooked up to Netflix so I can, should the programming be bad enough, watch a movie I have picked out. (Can only watch one movie as my CALS (wife) has to punch in those tiny little buttons on the Netflix box.) (Probably another good thing.)
In my humble opinion, I would suggest rearranging your meds so that your "May cause drowsiness" pills are taken at night so that you can take advantage of the drowsiness provided. If you need to take a nap during the day time, I see no reason not to, unless it prevents you from sleeping in the evening. A, relax and close your eyes and rest, session during the day provides for me a workable alternative to napping. One thing you might want to take note of: recently I decided to stay up and watch a NASCAR race being held locally at Kentucky Speedway. (on the family room TV.) My wife gave me my pills at the regular time and the "May cause drowsiness" pills kicked in causing difficulty in mustering enough strength transfer back to my bed after the race. I was "pooped out" all the next day.
At least, this is how I do it.