Ryan Reynolds thinks being a father is the ''best thing in the world''.

The 38-year-old Hollywood star - who has a six-month-old daughter James with his wife, fellow actress Blake Lively - has revealed how much he's reveling in the experience.

Ryan said: ''It's the most exciting time you can imagine.

''You try to get used to the idea of waking up several times in the night to feed your baby or change diapers or rock your child back to sleep.

''Sometimes you're in such a state you don't even remember getting up and walking in the house at 3am.

''Normally you'd go crazy interrupting your sleep that way but when it's your baby, it's the best thing in the world.

''For me, it's such a great relief to no longer be the centre of my own universe.''

And Ryan revealed that he ''couldn't be happier'' than he is at present.

He told the Daily Mirror newspaper: ''I'm in a great place. I have a family and a little girl, and I honestly couldn't be happier right now. There's just no place I'd rather be, it's the ultimate trump card.

''It seems almost unbelievable that she's already a half-year old. That's why I want to make the most of this time in her life.''