My dd had a cold a week and a half ago, still a bit snotty but the last couple of days she has slept a lot more than normal (normally sleeps for 12 hours but last night slept for nearly 14) and was so tired she went to bed an hour earlier tonight. She has been eating and drinking fine today, and nappies are normal but she has been very clingy and crying at everything. I'm worried about her. How long do I leave it before I go to the doctor's?