I've had a low back problem for years, which was under control but now has flared up again, along with an achy neck, which is a new issue, both of which are also clicking I've been back to a physio and am doing exercises. However, come early evening I can't keep my eyes open, and over the weekend I was sleeping on and off till lunchtime and had to force myself to get up. Has anyone had similar and could the fatigue be related?