There’s no question the potato starch raised my Bifido levels:
![Pasted_Image_4_25_15__9_52_AM.jpg Sprague Bifido over time](http://lh3.googleusercontent.com/-TDVQ565BjVQ/VTvHg8vJeDI/AAAAAAADBBI/oBdJ2U8iLwA/Pasted_Image_4_25_15__9_52_AM.jpg?imgmax=800)
But it seems not to have changed my sleep, either in overall hours:
![_var_folders_sl_k2p3_2pj51j64_dz8d3h127h0000gn_T_Rtmp3EtSEz_Preview-becb7e1cca17_html.jpg Sprague Z vs potato starch](http://lh3.googleusercontent.com/-hnfsBjBOH-4/VTvHchVHZ5I/AAAAAAADBA4/FmOZ06pPS_s/_var_folders_sl_k2p3_2pj51j64_dz8d3h127h0000gn_T_Rtmp3EtSEz_Preview-becb7e1cca17_html.jpg?imgmax=800)
or in a more precise measure, like REM:
![_var_folders_sl_k2p3_2pj51j64_dz8d3h127h0000gn_T_Rtmp3EtSEz_Preview-becb7e1cca17_html.jpg Sprague REM vs potato starch](http://lh3.googleusercontent.com/-PFGNQvjAuyY/VTvHe-u5G-I/AAAAAAADBBA/Cjab_3exSn0/_var_folders_sl_k2p3_2pj51j64_dz8d3h127h0000gn_T_Rtmp3EtSEz_Preview-becb7e1cca17_html.jpg?imgmax=800)
You can see from these charts that I did notice some fantastic nights of sleep after starting potato starch, but there were plenty of other nights when my sleep was back to normal and sometimes worse. If I hadn’t measured so carefully, I’d be tempted to overplay the good and underplay the not-so-good. If there’s a psychosomatic effect, then yeah it may have made me feel better, but in terms of actual sleep time, resistant starch doesn’t seem to have helped.