It completely depends on your adrenals. Strong adrenals can soak anytime. Weak adrenals can get wired at night and sleepy in the morning. So play with it. AS you soak and create better adrenal health you will be able to adjust your soaking time. Usually in the beginning nighttime is best as it is so relaxing. Then it becomes energizing as you balance adrenal function and then those adrenals get so happy they become balanced and you can soak anytime.