My 20 yr old, Aztec, has a bit of dementia. Forgets he has a full dish of food in the night and wakes me up with his really-loud-cause-he's-almost-deaf meow. Sometimes he goes down to the basement and yowls until I "rescue" him. Can't figure out if he's lost or just likes the sound of his voice reverberating off the concrete. I tried night-lights, Feliway diffusers, and flower essences but they haven't really helped. Would still be worth trying in your case though since every cat is different.
Make sure you have Coco's T4 tested when he goes in for a check-up (usually included in a full senior blood panel). Sometimes a hyperthyroid can manifest as restlessness and increased appetite. How is his weight? Notice any extra drinking or peeing?
"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler