Thus, immediate mobilization seems to be preferable after LP.in the study below, i do not believe 30 minutes is a meaningful length of time after which to assess the effectiveness of remaining prone.Journal European Archives of Psychiatry and Clinical Neuroscience Issue Volume 235, Number 2 / March, 1985 Pages 71-75 Is obligatory bed rest after lumbar puncture obsolete?Marianne Dieterich1 and Th.