You can have a Shiatsu treatment anytime in a day. The best time I recommend you is around 11:00 a.m. before noon. The morning air is clean and cooler, which will make your Shiatsu more comfortable. Generally speaking, I guess you had better Shiatsu treatment in the earlier time. Because a Shiatsu therapist are also getting tired after several sessions in the later time of the day. If the time allows you, please make an appointment for a Shiatsu session in the morning or early time in the afternoon.