i'm not sure but i think the key to remembering your dreams is to cut your sleep cycle.. they say that you need 2 hours to complete your sleep cycle.. try setting your alarm clock to a time that is 120n + 60 mins.. (give or take 20 minutes i guess) from the time you normally sleep..
and about sleeping at 4am.. i have a theory (as always).. hehe.. i've read somewhere that you have a tendency to remember your dreams more if you have them while in an almost awake state.. and since your body clock still believes that you should be awake earlier in the morning (which, i assume, isn't the time when you'll be waking up).. it starts to be more active during that time.. however you won't really wake up because you're too tired from staying up so late.. so you go into the almost awake state enabling you to remember your dreams more..
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and about sleeping at 4am.. i have a theory (as always).. hehe.. i've read somewhere that you have a tendency to remember your dreams more if you have them while in an almost awake state.. and since your body clock still believes that you should be awake earlier in the morning (which, i assume, isn't the time when you'll be waking up).. it starts to be more active during that time.. however you won't really wake up because you're too tired from staying up so late.. so you go into the almost awake state enabling you to remember your dreams more..
haha.. sorry for the essay of a comment..