Jumping spiders have REM-like twitches when they sleep, suggesting dreams may be much more widespread in the animal kingdom than previously realized. Daniela Rößler, a behavioral ecologist, collected local jumping spiders and housed them in clear plastic cages on her windowsill, intending to evaluate their reactions to 3-D-printed predatory spider models. When she returned … [Read more...] about Spiders Appear to Have REM-like Sleep and May Even Dream