Well, maybe more than a couple...
Figure this much, immediately: doing SOMETHING is infinitely preferable to doing NOTHING AT ALL.
If you're that motivated, even at an odd hour, maybe you should just go ahead and try calling and leaving a message. The only way it would be problematic is if their message machine or whatever is full. Which might happen by the END of the weekend, but perhaps not early-on in the weekend.
Sometimes us up-at-odd-hours types resort to the email method. You certainly can do that at ANY time of ANY day. You can find all the contact information you need, locally, regionally, and in DC at www.congress.org - their directories cover literally EVERYBODY on Capitol Hill. This, by the way, features not just phone numbers but fax numbers, email addresses of various kinds, and snail mail addresses, plus committee and staffers' contacts, too. The one other advantage to doing it NOW is that - you'll actually do it NOW. By Monday morning, you may forget.
But it IS helpful, if you remember, to call in also. I'm on the West Coast, so I've found it most helpful if I want to call all the way to Washington - to do so after I've taken the kids to school. It's still early in my time zone, but midmorning on the East Coast, and I've found they're a) likely to be in, in the first place; and b) I've found it easier to get through, earlier in the morning. And the advantage to calling and talking to a staffer in that Congressmember's or Senator's office is that sometimes you can throw in a second issue, or even a third. You can lobby a little. You can do a little fact-finding - like - "are you getting any other calls about this? What's the interest like out there?" Sometimes these brief encounters can be MOST illuminating, AND encouraging also. In addition, that staffer might offer some other info about what his/her boss is doing on that issue, whether he/she has authored or cosponsored any bills, whether he/she is going to be in the local area in the near future - maybe you can go press the flesh? And sometimes it simply helps to give your perspective. Sometimes you just might offer another argument that perhaps they haven't thought of yet - which might make a difference, change their mind in your favor, get them thinking, or add to their arsenal when THEY lobby for or against whatever it is.
Look, mainly, just do SOMETHING. If you don't, NOBODY will EVER know what you thought about it. ALWAYS weigh in if you get the chance. I mean, why else do you suppose people send messages in bottles? Because maybe, just maybe, SOMEBODY will see it.
BTW, for whatever it's worth, I humbly submit another thread to help encourage you further...
http://www.democraticunderground.com/discuss/duboard.php?az=show_topic&forum=132&topic_id=1587721 Cheers! Glad you're motivated. That's half the battle.