| http://www.w3.org/ns/prov#value | - These are quite varied and may include one or more of the following; a poor sleep environment (i.e. the bedroom is too noisy, too bright or too warm), learned poor sleep habits (i.e. watching TV to fall asleep), excessive use of stimulants (both medications and common substances such as caffeine and nicotine), certain medications, pain, medical conditions that may make it uncomfortable or difficul
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