Calling it seems the easiest way, but maybe the difficulty lies in not waking up anyone else. Maybe someone can figure out a way to trigger espeak via the microphone, as a voice command.
Plus, what fancy activities occur when needing the n900 at night in bed?
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Is that a N900 in your pants or are you just happy to see me?
This paint can glow for 12 years without needing to expose to light. It suits perfectly your need.
Now the only problem is that your N900 will always glowing. XD