Sleep?

So, our son has been sleeping horribly lately. He wakes up about four times a night now. He was just waking up once a night, which we could totally handle, but now it's ALL the time. The weird thing is, that there is no pattern to it. One night it might be every hour, but another night it might be every couple of hours. I have tried everything possible to get him to sleep better i.e. feeding him tons of food and having a routine. It seems to be just the way he is. He wakes up for the day feeling refreshed and we just want that extra minute of sleep. I know this can't last forever, but at the moment it does.