ipod nano 4th gen. battery?

i just got an ipod nano 4g (process of arriving) but i just wanted a heads-up on charging it. is it okay to charge the ipod when it is not in use, or when i go to bed. Like if i don't use/listen to my ipod, can i just charge it and still maintain the battery function after a number of years ( and if i do use it) i charge it when i go to bed . it is kinda stupid, but you know.....

and cna anyone tell me if this skin/case is good and in what way (kinda review it)

Belkin - Sonic Wave Silicon Sleeve

http://catalog.belkin.com/IWCatProductPage.process?Product_Id=462142

and tell me what you think

if you want full 10 points ya gotta answer both these question (all of them) to a poiint where even the dumbest person (not talking about mentally damaged people, handi-caps) but every day people would understand...
...

1) It's ok to leave an ipod pluged in over night to charge. It's not going to kill it, its actually better to keep it charged since lithium-polymer batteries work better when constantly charged.

2) Actually this would be a much better skin

http://www.zagg.com/invisibleshield/apple-ipod-nano-4th-gen-cases-screen-protectors-covers-skins-shields.php

The invisible shield, they even grantee you'll never get a scratch on it. and it's only .2mm thick, so its like its not even there, yet you can grip the ipod better.

(silicon and neophrene tend to act like dust magnets getting lint and such from your pocket stuck to it, also the case you picked out won't protect the screen itself).

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