how much does your 6 month old sleep?

[teresa]

just wondering how much other 6 month old babies sleep. DS has decided that 2 x half hour naps per day is enough for him and he can stay awake until 8-9pm at night all of a sudden. i did have him sleeping 3-4 x half hour naps during the day and going down between 6-7pm every night up until the last couple of nights. i am not sure if this is a phase he is going thru or not. finding it frustrating tho considering he was good up until recently.

TIA
xx