Make sure your getting all the required nutrients during your window….things like magnesium is critical to sleep…
I did the same thing for 8 months along with prolonged 4 and 5 day fasts until I got to my ideal weight …I’m 6’6” 190 and can see my abs…I went from about 255 to 190 in that time…for the last 4 months I’m just maintaining (which is a first for me, as I spent my whole life yo-yoing)…I opened my window from a 20-4 to an 18-6, and went from 1500 calories when I was losing weight to anything 2,000 or below now…I only throw in a prolonged fast if I slip out of my ideal range…
So, I would say to do 1,500 calories a day, not 500…especially if you are lifting as I do (weights, kettle bells) along with yoga and runs a few times a week…