2 year old keeps walking up

[EmRose123]

My 2 year old just does not sleep through the night any more. His up 2 or 3 time and it's always for at least an hour.
I'm just shattered. It doesn't help as I have to take him out the room so he doesn't wake his sister. It's been like this for a couple of months now and it's draining me.
Any suggestions?

Put him to bed later?
Drop his nap?

@Mulledjuice my only problem is we drive to pick his sister up from school and he always ends up falling asleep which doesn't help as it later in the afternoon.