As infections progressed, the phase of WT matched infections varied little, but the phase of rescheduling parasites (WT mismatched and Per1/2‐null TRF) diverged by approximately 10 hours to become aligned to host feeding‐fasting rhythms by day 6 PI (mean phase hour GMT ± SD: WT matched = 17.54 ± 0.18, WT mismatched = 6.26 ± 0.28, Per1/2‐null TRF = 8.14 ± 0.15). This evidence concerns the gene PER1 and infection.