Bedbugs, fleas and lice

Bedbugs (or bed bugs) fleas and lice cause great discomfort, and may spread disease.
This page is intended as a general guide to reduce such pests. For the specific pest, see its own page:
What is biting me?
BiteRemedy.com Spider and Bug Bite Treatment Guide has pictures, but the bed bug bites don't look the same as many other pictures available.
If there is a definitive guide to identifying bites, please add it here!
Control
Beware of pesticide use, especially on beds: significant amounts may be needed, which is harmful for the people using the beds.
These methods are recommended for bedbugs - would they work for fleas and lice as well?
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