Hello and Thank You for contacting JustAnswerI am sorry to hear your baby is having trouble.
I would love to help I just have a few questions
Any previuos medical problems
Is he on any medication
Does his abdomen look bigger then normal
Has he been eating and drinking normally
When was his last BM
What color are his gums
Is this the first night this as happened if not is he laying down during the day
How is he now
I apologize for the delay I typed you answer and for some reason it did not go through so I had to retype it.
Refusing to lay down in an older dog normally indicates pain in the abdomen, back, hips or most importantly trouble breathing.
When problems develop in the liver or heart this can cause fluid to build in the abdomen chest or lungs. When this fluid begins to build it becomes difficult to breath which results in refusing to lay down and often neck stretching if they do lay down.
There is a condition known as canine cognitive dysfunction which causes animals to change their sleep habits and sleep more during the day I do not think this is the problem but I will include some information on this .
I would suggest having him seen this morning by your vet to be sure this is not related to fluid build up causing him to have trouble breathing due to fluid build up