I just got my puppy today, he's a 10 week old bichon frise and he got hyper in the middle of the day at around 2-3 o'clock, but then about 4-5 he started falling asleep? like.. while standing up one eye would slowly close and he would fall over. he hasn't been very playful since then. he was really yappy at around 2-3 too. Is this normal? is he just adjusting?