study - research or investigation into a subject, struggling - having difficulty doing something, insomnia - the condition of being unable to sleep, disorder - illnesses or conditions that disrupt normal physical or mental functions., backed by - supported or funded by., procedures - established ways of doing something, carry out  - to perform or complete a task., strains   - pressures or forces causing stress or tension., forty winks - a short nap., deprivation - (noun): the lack or denial of something considered essential, detrimental - causing harm or damage, recall  - to remember something, correlation - a connection or relationship between two things., period - a length of time., doubted - felt uncertain about; questioned,

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