Is there a problem with using the WAV format for non-audio signals? I have biological signals sampled at 1 kHz. The signals tend to behave fairly simply, sinusoidally. The software I've used to collect these data uses their proprietary format (*.adicht) and so I have to export to something I can work with in MATLAB, for example. I also have audio recordings from the same sessions for importing to praat, which accepts WAV files.

The formats available for export include WAV, tab-delineated text, and an unwieldy .mat conversion process that sometimes causes the program to crash. 

My question is whether there is a disadvantage to exporting everything as WAVs, or a specific reason why I would want to use text over WAVs? Is there a drawback to using the WAV format for non-audio signals, or is it just unnecessary? 

It will save me a lot of time if I export to a single format, and since I know I need WAV for audio analysis in praat, it would be easier just to export the non-sound signals that way as well (this program does not handle macros/batch scripting very well).
I think WAV will be a good format for your data as it supports:


Integer Hz sampling frequencies (like your 1000 Hz).
Integer sample formats (like 16-bit, 24-bit, 32-bit).
A floating point sample format (32-bit IEEE float).
Multiple channels.
Seeking (quickly reading the file at a specific time point in the audio).


Other nice things about WAV:


You can use FLAC to compress WAV files for storage and transfer.
WAV files can also contain non-PCM data (such as markers and metadata).