What is omitted between the more tasks and and? 'the to-do lists had'?
The results in the Journal of Experimental Psychology confirm that not all pre-sleep writing is created equal. Those who’d made to-do lists before bed were able to fall asleep nine minutes faster than the ones who’d written about past events. The quality of the lists mattered, too; the more tasks and the more specific the to-do lists were, the faster the writers fell asleep. On the flip side, those who wrote long lists of accomplishments took longer to fall asleep than those who’d thought of fewer past activities.
[Source : This 5-Minute Bedtime Ritual Will Make You Fall Asleep Faster] (https://www.rd.com/health/wellness/mind-racing-sleep-trick/)