Simple but tricky riddle

[shmanalise]

I was surprised how long this one took me for being so seemingly simple 

What falls but never breaks, and breaks but never falls?


Hope you guys can get it faster than I did 

[braggin]

How about night and day? Night falls and day breaks. 

[mill8277]

Day falls and Night breaks...is that it?

[gaylasue]

The night falls and the day breaks.

[jkhanson]

I was surprised how long this one took me for being so seemingly simple 

What falls but never breaks, and breaks but never falls?


Hope you guys can get it faster than I did 

My first thought was a singing Voice.  It "falls" as someone sings lower and sometimes a voice can break but it really isn't "falling".

Second answer:  Night falls; Day breaks