I think i am teleporting....or something?

i have never been a sleepwalker...but for the last three nights i have gone to sleep i have woken up on my front porch already fully dressed...at first i thought i might have been sleepwalking and i just locked the deadbolt....don't have a key for it so it has to be locked from the inside....i was the only one here and i still woke up on the porch. The deadbolt was still locked and i only have that one door as i have sealed up the other one for insulation reasons....all the windows were locked and they can only be locked from inside......WHAT IS HAPPENING AND HOW CAN THIS BE?