Jessica zonked out for 3/4 hours after her first set of jabs. I remember I hadn't planned anything for that day as I wasn't sure what was going to happen so sat about twiddling my thumbs for ages while she slept lol! It wasn't until about 8 hrs later that she became unusually grizzly and feeding/cuddles didn't help that I gave her calpol which really helped. My point is, like others have said, at 8 weeks if you've given her it beforehand as you are very limited with the amount of times she can have it, she ay not be allowed another dose by the time you really need it! Good luck, it is worse for the mummies than the babies I think...I dreaded it but all was fine so try not to worry too much xx