My baby Tweety (cat)

My precious Tweety kitty was deaf and had a spinal cord injury. I did everything for him for 18 yrs. He would try to walk around on my bed at bedtime, because he slept with me. After he passed for about6 months I felt something walking on my bed like he always did. It would wake me up but when I'd look the bed was empty. I know he was still with me letting me know he's happy.