Data_timeformat</code> is not
expected for Fitbit as we assume that the timestamps are always stored
with the same internal format inside the .json files.</p>
<p>To use the sleep classification as stored inside the data use
parameter <code>HASIB.algo = "data"</code>.</p>
</div>
</div>
<div class="section level2">
<h2 id="handling-study-protocol">Handling study protocol<a class="anchor" aria-label="anchor" href="#handling-study-protocol"></a>
</h2>
<div class="section level3">
<h3 id="not-worn-during-night">