NOVA scienceNOW Sleep13:16Video duration: 13:16 Aired: 07/10/07 Rating: TV-GVideo has closed captioning. Why do we need sleep? Part of the answer may be to strengthen memories. Add to WatchlistShare:Share this video on FacebookShare this video on TwitterShare this video via EmailShare this video on Google PlusEmbed Code for this videoEmbed Code×CloseNOVA scienceNOWSleepPremiere Date: July 10, 2007, 4:01 a.m.Width in pixels px Height in pixels px Please copy this text to your clipboardProblems Playing Video ?Report a problemClosed CaptioningReport a Problem×CloseBefore you submit an error, please consult our Troubleshooting Guide.Type of ErrorVideo doesn't loadVideo loads, but doesn't playVideo jumps back/forwardOnly audio is streamingSponsorship playback errorOtherPlease add more detailsCancelSubmit ReportYour report has been successfully submitted. Thank you for helping us improve PBS Video.Close Funding for NOVA ScienceNOW is provided by the National Science Foundation and the Alfred P. Sloan Foundation.