Quiet toy to entertain cat at night

Hi there

I have an old cat (15 y/o). He tends to meaow a lot in the middle of the night and early morning, which seriously disturbs my sleep. He has enough food and water and nothing wrong with his health. He stops as soon as I come to see what’s happening. So I think he feels lonely and he is bored during the night. I’m looking for quiet toys and games (automatic?) to keep him entertained during the night.

Any suggestion?

Thanks