In the UK and Europe we switch to BST in three weeks time. Like lots of us with ME this is very disruptive and going forward is particularly tricky, for me it can't be done in one go at all. (For those in the US and Canada, it's only a week to go, but the staged shift can still work). In anticipation I've already put my "clock" 15 minutes ahead this week - using a dawn riser to have the light come on early - and will continue until the end of the month when hopefully it will all be back in synch. The light is the key thing here, not a guarantee but hopefully helpful for some.