Hi Julia
welcome, and i really hope your stay here is a really brief one!
i think the days that docs get you to take clomid all depends on the doctors - from what i've read, they're no particular reason why they choose different days - although days 5-9 usually results in later O if it does it's job! as for taking clmid at night, i was advised this was the best way to take them to avoid the side effects. apparently if you take them at night, the bulk of the hormonal fluctuation (including the natural ones) occur while you're asleep and you avoid a lot of the nasties! i had 3 cycles of clomid (up to 150mg - 3 tabs) per day, and had pretty negligible side effects.
HTH
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