To me, this song IS happy, but underneath it all, there is unease and obviously some doubt. The couple is happy, but they both can't help but be afraid that their lovers will eventually cheat on them and/or leave them. Everything between them is wonderful until they fall asleep, which is where their subconscious thoughts surface. The love between them is absolutely overpowering, they just need to learn to get over their insecurities. Also, 'i will be fine, just say you'll stay forever mine' shows that there is one person in the relationship that needs constant reassurance from the other to know whether they really care about them or not. But even this can't rid them of their feelings of unease.
To me, this song IS happy, but underneath it all, there is unease and obviously some doubt. The couple is happy, but they both can't help but be afraid that their lovers will eventually cheat on them and/or leave them. Everything between them is wonderful until they fall asleep, which is where their subconscious thoughts surface. The love between them is absolutely overpowering, they just need to learn to get over their insecurities. Also, 'i will be fine, just say you'll stay forever mine' shows that there is one person in the relationship that needs constant reassurance from the other to know whether they really care about them or not. But even this can't rid them of their feelings of unease.