same boat here - day sleeps are 40 mins - I have tried going into resettle her but she sees me and just starts laughing!!! Last few nights - night times have been every two hours - not sure if this is a phase she is going through or what - but the daytime sleeps have been happening since she was 6 weeks old. Unfortunately I don't have any solutions either!!! But you aren't alone, I spoke to my paediatrician about it and she said some bubs don't even sleep during the day, have also spoken to other people who's bubs have done this as well....I read about babies who have 2-3 hourly sleeps during the day and am very jealous!!!
Laurin