Try a quick power nap. Folks here know I am a big proponent of the nap. Naps are hugs we give ourselves.
Start by picking a regular time each day or evening. Just sit/lie with your eyes closed for that 15-20 minutes each day, even if you can’t sleep. Soon, your body will come to expect this, and will relax, enabling you to actually sleep for 10-15 minutes.
I’m to the point where I am out in 2 minutes, and wake up in 10-12, relaxed, refreshed, and mentally alert.
Hug yourself. Take a Nap.