I've been on the 5:2 diet for 4 weeks now, and am basically loving it: hunger under control during the day, initial headaches gone, more energy on fast days etc BUT, and it's a big 'but' - I can't sleep after a fast day. partly because my mind's going but partly because I feel so hollow inside. I don't want to give up, but sacrificing two nights' sleep (and feeling dreadful on the days that follow) is too much. HELP!
