YOU SAID:

While I sit here I want to take a nap

INTO JAPANESE

昼寝したいここに座っている間

BACK INTO ENGLISH

While you're sitting here you want to take a NAP

INTO JAPANESE

ここに座っている間昼寝したいです。

BACK INTO ENGLISH

You want to take a NAP while you're sitting here.

INTO JAPANESE

ここに座っている間、昼寝したいです。

BACK INTO ENGLISH

You want to take a NAP while you're sitting here.