Imagine for a moment... it's Saturday morning. The house is dark and quiet and you've miraculously been able to sleep in until 9am.
(I'll let you stay in that dreamland for a moment.)
It's time to wake up. Music comes on and gently wakes you. It starts very quiet-- so quiet you can barely hear it-- and it gradually gets louder, coaxing you awake. It's music you love. What's your mood?
Now, imagine for a moment... the same scenario. It's Saturday morning in a dark, quiet house and you're blissfully able to sleep until 9am.
It's time to wake up. Then, as if there's a speaker right by your ear, IMMEDIATELY LOUD heavy metal music plays and shocks you out of bed. What's your mood now?