Also, check out Vipassana meditation.... It is not a guided imagery meditation but rather the use of our breath and awareness of our bodies. I found it to be the answer for me (guided meditation felt to whooo hooey for me)... Star breathing technique is awesome because the control of breath helps us to calm ourselves in all situations and the awareness of our body gives way to knowledge of how we react to stress or lack of sleep, etc... Truly a valuable practice!