I wrote script to temporarily disable next alarm (e.g. I woke up before alarm and don't want it to start). Time from now to now+hour is searched.

Code is ugly but it works.

Copy it to /home/user/.bin (create it), rename w/o ".txt" and make it executable (chmod +x /home/user/.bin/silencenextalarm)

Requires python-alarm package.

You can add it to desktop using Queen Beacon for example.