tempdb log file usage huge by sleeping status sessions but not relased the space

We have a alert threshold of tempdb usage on drive level at 90% and getting lot of alerts. But the first problematic point is the tempdb usage occupied whole drive of 500GB among Log file only occupied 95% and not able to increase the log file for other works on tempdb. While we checked the open transactions we seen sleeping sessions are there 2days and 1day before time stamps and not released the space to other transactions. I think it's worst behavior the sleeping sessions blocked the space and released to the others. We need the script for Is really those sessions are occupieing the LOG file space and not released them. (I came to know jdbc drivers sessions suddenly drops and so that the sleeping sessions are not released the space to other transactions). Can you provide Is there any script to identify the same.