Fix: Sleep Analyzer Import

[richrobe]

No description provided.

[richrobe]

This PR fixes bugs occurring when attempting to import sleep analyzer data.

[codecov]

Codecov Report

Merging #19 (9a2ec35) into main (08ba524) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   49.62%   49.66%   +0.04%     
==========================================
  Files          93       93              
  Lines        7212     7218       +6     
  Branches     1361     1361              
==========================================
+ Hits         3579     3585       +6     
- Misses       3563     3568       +5     
+ Partials       70       65       -5     

Impacted Files	Coverage Δ
src/biopsykit/io/sleep_analyzer.py	98.98% <100.00%> (+0.06%)	⬆️
src/biopsykit/stats/stats.py	18.27% <0.00%> (ø)
src/biopsykit/protocols/_utils.py	28.94% <0.00%> (ø)
src/biopsykit/utils/data_processing.py	15.00% <0.00%> (ø)
...ation/model_selection/sklearn_pipeline_permuter.py	19.71% <0.00%> (ø)

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