I have yorkshire terrier who is nearly 5 months old, we have had him since he was 10 weeks old. The first few nights he slept through until the morning, but now he constantly wakes up at 4 o clock onwards. It is hard to ignore him as much as I try.
If we get up and put him back in his basket he is OK for another 30mins or so but then starts again :( (He sleeps in the kitchen)
We have tried leaving our clothing down as I heard this makes them feels comforted. But nothing seems to work.

Does anyone have any ideas of what might work?

Also, do you have any tips on house training as he still has not grasped the hang of it completely?

There may be something which you can not hear, a neighbor getting up, papers being deliverd or something else, which he is reating to. Are you taking his water up 1-2 hours before bed time and then putting him out? At that age the more times you take him out and tell him good ______ when he goes the better. Praise and a treat when he goes, then verbal only scolding when he goes inside and take him out. Use only one word, the same one every time. He could be alerting you that he has to go to the bathroom, take him out.