Orgasm from memory of previous orgasm

Recently I've begun having orgasms , hands free in bed, when fully awake. I've asked my wife if she made me orgasm during my sleep , earlier on, and answer is yes. Sometimes it feels like she's giving me a hand job, other times oral. The hands free, lying there , orgasms match the way she brought me to orgasm earlier on. It's like my body records the experience when I'm sleeping, then plays it back once I wake up. The orgasms aren't as intense as the ones she gives me, but still, rather nice.