Hullo again, Hans
A few suggestions below.

Vic.

In the middle of the night I lay with my eyes wide open
Because of all the tensions that can't wait
Buzzing around me like angry birds (raging and angry have the same meaning in this context so lose one of them)
And those nights I became so afraid (It seems you are having more than one sleepless night so use "those nights").

chorus
I used to slept so easily, but then the world changed (easily is a better word to use in my opinion)
Problems were driving me insane
Wars, hatred, and greedy ego's, there are so many
But come morning I hadn't solved any (This chorus is mainly in the past tense so use the word "hadn't ").

In the middle of the night I have my eyes wide open
Disturbing thoughts that cannot wait
They swirl around me like bloodthirsty bats
And each night I become more afraid (This verse is present tense so the words would be "swirl" and "become")