Don't take it personally like the others said... Cats just change their minds about locations
They must be Gemini's... only way to explain alot of the behaviors I've seen !!
I had the same thing happen. Jarama used to sleep beside me on my pillow when he was a few months old, but as he got older he decided he just didn't want to share the bed anymore and started to find new places... he goes from one to another different nights of the week. I took it personally at first and was a little saddened but quickly learned that he's not mad at me, just... needed a change. He's growing up.
Urraco never really slept in my bed with me when I brought him home, but always tags along with Jarama instead (who was somewhere else).
Recently in the past week or so... I've woken up nearly every single morning to both of my kittens wrapped around each other right beside me half on the bed, and half on my pillow with me (sleeping like humans, head only on the pillow, body on the bed!)...
They just sleep where they want
Sometimes it's with you, sometimes (alot of times) it'll be under the bed.... and then you have nights where they sleep in the bathtub, in the middle of the floor... by a window... or on your business paperwork :P It's just... something they do.