We have a 4 month old puppy who has been in a crate at night from the time we got him. He was sleeping through the night until 6, but all of the sudden is now getting up at 3, 3:30 or 4. I try letting him out to relieve himself (no lights, no talking, etc.) and then putting him back in his crate, but he barks continuously. I only did this two times and then finally gave in and got up with him. This has only been going on for 4 days and I want to nip it in the bud asap before teaching him bad habits. Any advice would be great!