Prolonged bed rest (more than 2 days) in acute localized low back pain has not been shown to improve long term function or pain. Bed rest prescriptions should be limited to less than 48 hours in patients with non-traumatic acute localized low back pain in the absence of traditional red flag signs, including, but not limited to, tumors, neurological issues, and weakness.
Dahm KT, Brurberg KG, Jamtvedt G, Hagen KB. Advice to rest in bed versus advice to stay active for acute low -back pain and sciatica. Cochrane Database Syst Rev. 2010 Jun 16;(6):CD007612.