I wouldnt consider myself a beginner at lucid dreaming considering ive had at least one lucid dream every night for a while now. But ive yet to have a lucid dream over three minutes long. I cant use any of the dream prolonging techniques because my dream ends so abruptly. One minute I'll be trying to do something, the next minute I'll be staring at blackness with no sense of a dream body. I dont get excited, I dont even try to control my dream in any way, really. Once, I thought that it could be outside things were waking me up, so i changed what time to do wbtb. Still no result. Its frustrating because of all the time i put into lucid dreaming i can only spend 3 minutes of every day actually in one. Can anyone whos a little bit more experienced in staying in a ld give me some helpful pointers. Id appreciate it.