I have an awesome beautiful classical guitar , a yamaha c-40 ( yes cheapo , but doesn't look\sound it) . It sounds and plays great , with the exception of a few dull notes , esp past the 10 fret on the G , and D strings...bad intonation or whatever ....but other than that , it's great .
But the thing is , for some strange reason , after the magical hour of i guess 12 AM , my guitar suddenly loses those dull spots , intonation becomes perfect , hell , it even looks nicer . The sound goes from being 'just good' to.. cd quality

. Every note rings so crisply and clearly , and it gets an almost ...sultry 'voice' to it.. like sexy lounge singer voice if you know what I mean
Why is this ? change in humidity at night ? temperature ? Anybody else have this happening to them ? Like special time of day where the guitar just shines ?
I'm crazy .. yeh I know....