Premanand Maharaj Ji
Why do I feel lazy and dull in my naam jap after starting with enthusiasm?
Laziness comes from the cycle of gunas
Three gunas (qualities of nature) are sattva, rajas and tamas, and they turn in a cycle. When tamas comes, sleep and laziness arrive, so keep patience and do not take another path.
When tamoguna comes, there is sleepiness and laziness. Old grudges come up, and anger and ill will begin. This is how it goes.