Laura, Igor was awake 2 hours every nights from 1 year old until he was about 17 months, we tried everything, shorter naps, more activity during the day (which sometimes worked) and after a long time it started to be better, but he kept on waking up during those days I was working evening. Everything got solved when we got a place at a kindergarden and thus I could change my work schedule (no more week-ends). We never found out what it was all about, SP teething need of more activity...nevertheless it was awfull, and he slept in our room too, so that didn't help. Things will get better...I know you want it now, but it does get better. He actually woke up for 1 hours 2 times this week and that was because I let him sleep as much as he wanted during the day (usually he sleeps 1.5 hours at the kindergarden during the week and about 3 hours at home), we're on vacations so I decided to let him sleep as much as he wanted, well I quickly learned my lesson and I wake him up at 1:30pm...2 hours sleep.
Good luck!