Losing the ability to nap was the single most difficult adjustment I had to make when I went back to an office job after seven years working remote. I didn't take long naps, but the ability to lie down and close my eyes for twenty minutes after lunch every day made a big difference. It was also helpful, when I really needed to get some serious thinking done, to have somewhere I could lay back and shut my eyes and really just focus on the problem for a while. The one and only time I tried this at Microsoft, someone burst into my office in panic when they saw me lying down, afraid I had collapsed from a stroke.