1.
it's Ok to used the laptop on bed, the important is you have an air exhaust for the laptop
2.
When you closed your laptop LCD, do not bump, it may trigger the hard disk hot soft area.
3.
Do not moved the laptop or bump, hold it easily
4.
Do not always closed the laptop LCD if your not using it, this may cause LCD burn, specially on hot and cold surroundings.
5.
Do not throw it, give it to the poor in case you want it
good luck