Lise - probably is a phase. I am learning that nothing is permanent in this parenting lark. Even the good stuff! Just when you get used to a certain behaviour they go and change it on you! Sleep often changes aRound teething or a developmental leap as well. DS slept very little when he was learning to sit up, roll over, brawl and then walk! Which with teething periods in between added up to very weird sleep patterns for months on end. Some days we get big naps and on others nowt at all. Good luck!