You can trick yourself into leaving your body according to Muldoon and Carrington [MC29]. They suggested that if the subconscious desires something strongly enough it will try to provoke the body into moving to get it, but if the physical body is immobilized, for example in sleep, then the astral body may move instead. Many motivations might be used but Muldoon advised against using the desire for sexual activity which is distracting, or the harmful wish for revenge or hurt to anyone. Instead he advocated using the simple and natural desire for water — thirst. This has the advantages this it is quick to induce, and it must be appeased.
In order to employ this technique, you must refrain from drinking for some hours before going to bed. During the day increase your thirst by every means you can. Have a glass of water by you and stare into it, imagining drinking, but not allowing yourself to do so. Then before you retire to bed eat ‘about an eighth of a teaspoonful’ of salt. Place the glass of water at some convenient place away from your bed and rehearse in your all the actions necessary to getting it, getting up, crossing the room, reaching out for it, and so on. You must then go to bed, still thinking about your thirst and the means of satisfying it. The body must become incapacitated and so you should relax, with slow breathing and heart rate and then try to sleep. With any luck the suggestions you have made to yourself will bring about the desired OBE. This is not one of the most pleasant or effective methods.