Just as the spaceship was traveling faster than light, you are traveling faster than snail-mail, so you beat some (or all) of your mailed selfies home. The day after your homecoming, the mail carrier delivers two of your pictures: one from the trip out, and a second from your trip back.
Ongoing research has shown that oral melatonin supplements can promote the dipping process. They can reduce nocturnal systolic blood pressure by about 6 mm/Hg, and diastolic pressure by 4 mm/Hg. Not surprisingly, the studies also indicate that melatonin improves sleep quality, which allows the body to relax more.
The effect of behavioral stimulant doses of amphetamine on blood pressure. Simpson LL. Blood pressure responses to amphetamine have been studied both in humans and in rats. Blood pressure was monitored in patients who had experienced an adverse behavioral reaction to the drug. All of the patients had self-administereed amphetamine, and later sought medical attention for their adverse reaction.