Translate the Tweet: Descansando
Let's see how we do this time. This one is a bit tricky, because it does not have much context. Still, if you give it some thought it shouldn't be too hard.
Descansando el trasnocho mientras espero mensajito para seguir. Todo bien, pero mucho trabajo
Native Speakers please give the students a chance to get it right!
Please see an explanation of this tweet, and the reason for my chosen answer, in my post marked: "Explanation". This was fun!
27 Answers
Ok my last try - I think everyone else has gone to bed. (This with the clue - he was working all night). Resting up after my 'all-nighter' while I wait for a text to continue. All going well but it's a lot of work.
Taking a break from pulling an "all-nighter" while I wait for a short message (text?) in order to proceed. Everything's ok, but there's a lot of work.
Could there be a missing d in front of el trasnocho, ie, descansando "del" trasnocho, I think my try would make more sense if so. If this person is working hard on a project, I imagine he has to put in lots of "all-nighters", very late hours, but is now taking a break whilst waiting on a message of some sort in order to proceed with the project.
Explanation
Ok, the original tweet:
"Descansando el trasnocho mientras espero mensajito para seguir. Todo bien, pero mucho trabajo"
I think we can dispense with the last bit, which essentially everyone got right: "All's fine, but there's lots of work":
Two things threw everyone off: "el trasnocho", and "espero mensajito" (this one surprised me a bit). The problem with "trasnocho" is compounded by the fact that is preceded by "descansando el", to make an unorthodox, but valid, expression.
Trasnocho, as several people figured out (with huge credits to Marianne!), means to stay up late,or all night. "Me trasnoché" - "I stayed up very late" or "I stayed up all night". I went through the night.
So: "Descansando el trasnocho": "Resting from, or after, having been up all night. "Pulling an all-nighter",or "burning the midnight candle" are good English equivalent expressions, in this context.
"Espero mensajito": I wait for a text message, and SMS.
So: "mientras espero mensajito para seguir". What happenned? My friend had been working all night on a project, and then came to an end, for some reason. Maybe the client had to check the work done thus far, or maybe more material has to be provided - we don't know. But he needs some sort of "go-ahead", by means of a text message, before he can proceed. While he waits, my friend is resting, recovering his energies, in readiness to proceed.
So I think Margaret's answer best sums it up: "Resting up after my 'all-nighter' while I wait for a text to continue. All going well but it's a lot of work."
Very good team work, and some really fun, creative answers there! 
Descansando el trasnocho mientras espero mensajito para seguir. Todo bien, pero mucho trabajo
Taking a break from the all-nighter while I wait on a text (message) to continue. Everything is going fine but a lot of work
Recovering after working all night, I am waiting for a text in order to continue (with the project). Everything's fine. Too much work. 
My thought is that he isn't resting at all, he is still working. The thing that is "resting" is the "transnocho" and I don't even think it necessarily has to do with the late night. Very interesting puzzle.
My thought: He is in some kind of night position > The night owl is taking a rest while waiting for a sign to continue. All is well, but there's a lot of work (to be done).
Truly, this is the last try.
Resting after working all night, I'm waiting for a text message to go ahead. Everything is fine. Too much work.
One more shot antes de darme por vencida.\
Resting after staying up late while I wait for a text message to go ahead. 
Descansando el trasnocho mientras espero mensajito para seguir. Todo bien, pero mucho trabajo
Resting up from the night out while I wait for a message to continue. All good but lots of work.
Descansando el trasnocho mientras espero mensajito para seguir. Todo bien, pero mucho trabajo
Taking a break after burning the midnight candle while I wait for a message to resume. It's alright, but it's a lot of work.
P.s. To the other SD members: "trasnocho" is in the R.A.E.
Another try:
Taking a night off while I wait for a short message in order to proceed. Everything's fine, but there's a lot of work.
Relaxing after staying up all night, in the meantime, I'm waiting for a message/text in order to go ahead. Everything's fine, but there's a lot of work.
Resting my weary bones while waiting for a text to continue. All's well, but lots of work.
?
Another attempt!
Giving the "all-nighter" a rest while I wait for a short message/text in order to proceed. Everything's ok, but there's a lot of work.
Resting from a night out at the clubs, waiting for a text message. All is fine, but there is much work.
