Help needed in plan details

i want to know about bsnl 3g plan
in 549 plan whether 5gb in night is given only once or daily basis
and what about 1gb

chk bsnl website

in that 1 gb is for whole moth's day usage and the 5 gb is same for whole month's night usage..(it doesn't mean that u can use 5gb every day but you are having total of 5GB which u can use anyway).