PER1 and infection: During rescheduling (ie WT mismatched and Per1/2‐null TRF groups), parasites experience minor reductions in synchrony (Figure 4a) but do not incur costs in terms of the densities achieved during either the pre‐ or post‐peak window of infections (Figure 6), and infecting an arrhythmic host (ie Per1/2‐null all‐day fed) does not impact parasite density (Figure 6).