So\Because

[Tdol]

[Buddhaheart]

I would vote because here. But I won’t forget an archaic use of the word "so" to mean "if" or "on the condition that" as a conjunction.

[M A L I K]

I think u can't say ''so'' because u gave us a reason why u r tierd !!

[][MojaziF][]

It is because

[shining truth]

hi friends,

It's because, for it gives a reason for going to bed.

Yours,

[sting]

It should be because coz you are telling the reason

[Carmenn]

''Because'' is the right one.I want more of these.

[nobita]

hi friends,
it should be because as you are telling the reason

[kaouther]

I would say "because".

[masterbg]

yes it`s is because