Jetlagged in London

I was rather silly today, for my first day in England: I arrived at The Generator at about 7am this morning; and once there, I promptly went to bed. "I'll just have a nap for a few hours", I told myself, "my alarm's set for 10am". Big mistake! My alarm didn't wake me, of course; and when next I woke, I discovered that it was 2 in the afternoon. Oh s$%# — perfect recipe for jetlag. Should have kept myself awake all day today, and crashed in the evening. I guess that being in The Americas for so long has made me forget about jetlag, as it's been a while since I had significant time zone differences to cope with. I can only hope that it will only take me a few days to recover from my mistake, and to adjust to GMT.