Kitten (10 weeks) had his first vaccinations at 9am today. The vet said they might be very sleepy today, which he has been, but whereas his brother has been prancing around as well as the sleeping, the other one has been very very quiet, unsteady on his legs, not eaten or drunk anything (but has had a wee) and looks really spaced out. Is this normal? He won’t give me a purr either which is very sad :(