I usually only sleep about 6 hrs per night because of that I can easily be fatigued the next day.
If I take a nap, it is always limited to 20 minutes exactly. I set my alarm on my phone (already have it set up to time down 20 minutes.) I lie perfectly still and don't open my eyes.
If you can let your frontal lobe rest for 20 minutes (take in no new information} you will feel refreshed. You don't necessarily need to actually go to sleep.
I learned this technique over 30 years ago and, for me, it always works.

Just getting up and going tires my husband, so he sleeps-more than a nap-around noon, then a nap in the afternoon. It really cuts into activity but if he doesn't nap his symptoms are worse for several days.

I have had sleeping. My doctor recommended melatonin. It helps with the dreams. Tones them down. I take a 10 mg tab. You can buy it over the counter. Non habit forming. When I take mine I drink hot/warm milk.. Solved my problem

Thank you Bettye, I am anxious to try your technique! Maybe this is why I have been envious of friends who can "cat nap".. Lay down for no more than 20-30 mins and up promptly feeling refreshed and wonderful!

Pace your day. If schedule too
Much in one day the next day I am
Down for the count! Sometimes for 2!'