Since when i started to have short term memory lost

Today , i went to the VAD 1st meeting at SUTS with a friend of mine. There are many activities suggested by them and it sounds quite interesting for me . Anyway , today they have blood donation activitiy .

(haha , that was me during 2005 XP)

Anyway , is time for me to write about the real problem that i am having now and this also started to happen to me since last year. When i reached home from uni , i will take a nap during the time from 6.00pm to 9.00pm. This may sounds a normal sleep only but if i tell all my friends that i have short term memory lost for about 20 seconds daily when i wake up from that particular sleep , what will u all think ? My real problem is when i wake up i will forgot what day is today and also what am i busying recently and i always need about 10 seconds to 20 seconds to remember back what happened to me recently (It sounds stupid right ?). Today, when i wanted to sleep i told myself not to forget what am i doing today and the weird part is i really had a dream about that and i dreamt of i dont have that short term memory lost problem today but that was only a dream . As usual that short term memory lost happened to me again and i started to wondering what will i be if continue like this . Anyway, PLEASE REMIND ME WHEN I STARTED TO FORGET ANYTHING >.<