My dogs all sleep in my bedroom so not much help there I'm afraid. However, my thoughts are along the lines of:
1: What time does the barking start?
2: Could it be badgers/foxes that are disturbing him?
3: Could it be any neighbours moving about?
4: Could it be your central heating switching on/off?
Knowing what is causing the barking is the first step to stopping him.
We need more info.........
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