Replace your cordless phone with a regular wired telephone.
Healthy HouseTM TechTip
Many cordless phones continuously emit EMF radiation even when not in use. So if your phone is just sitting there in the base station, there is good chance it is emitting high levels of RF radiation throughout your home.
Your best bet is to replace your cordless phone with a plain old wired telephone. At the very minimum, move it as far from your sleeping area as possible.