I use the alarm clock on my iPhone derp <_>
Does it work with your laptop screen down or ?
No, although it can if you set your laptop to do nothing when closed.
I use a complex mechanical device triggered by sunlight entering my room at the specific angle denoting the time I wish to get up, which completes a string of processes ending in a bucket of water dumping on my head.
Get one of those clocks that farts every hour