Who is the scientist most associated with dreams?

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 Who is the scientist most associated with dreams?

What kind of scientists study dreams?
Work in oneirology overlaps with neurology and can vary from quantifying dreams, to analyzing brain waves during dreaming, to studying the effects of drugs and neurotransmitters on sleeping or dreaming.

 Which two scientists first started researching sleep? What tools did they use? What did
their research tell us about sleep?