John: Just the feeling.
Yes, just his presence around you is what relaxes you. Knowing he's beside you when you sleep, and hearing him walk around the house even when you can't see him nearby, relaxes you more than anything.
Paul: Knowing that he'll never spend a night away.
Of course, (like Linda) Paul would never leave your side. He makes absolutely no exceptions for letting you sleep alone. He's going on tour? You're going on tour with him. To know that there's no possible way you'd have to sleep without Paul, fills you with nothing but relaxation.
George: His guitar strumming.
The way George tunes and makes sure his guitar plays the beautiful notes it always plays is truly a heartwarming feeling. The notes always come out pretty, and when he messes up accidentally, his reaction is just the funniest to see.
Ringo: His constant protection.
One of the many blissful things Ringo will ever do is provide love and protection. Whatever you need, he's got it for you. He's always making sure you're well cared for if away, he practically spoils you. No wonder you feel so relaxed.
