I did 5:2 last year for about three months and got on really well with it. I then fell off the wagon and have restarted. Its all going well, except for the insomnia on fast days. Is there anything I can do about this? At the moment I have a lunch and a dinner of 250 calories each. I would love to have full dinner only but in the late afternoon I have much rushing around, collecting multiple children and found myself feeling bit faint without a lunch. Any tips from all you lovely experienced fasters?