Lol, funny you should mention Japan, my husband is a marine and we were there for my first pregnancy (well part of it anyways). I now had a two year old toddler that when I was earlier in the pregnancy went mad from boredom because I was so sick. I work in a OB clinic (until recently when I decided to take a leave) and I came across a lot of useful information that helped me with my son. First, I would like to say if you can drink a LOT of water. Each hour the body replaces 1 cup of amniotic fluid with the baby (my doctor explained this to me) so ultimately you should drink one cup of water an hour. Not only does this help cleanse the body of toxins, prevent UTIs, and refresh the amniotic fluid- it also helps a great deal with nausea. Water can actually help with a diluting effect on the hormones. If/when your body is dehydrated it tends to use whatever resources your body has, water from muscles etc, and turns it into fluids that can be absorbed by vital organs etc. With low fluid levels the hormones can have a stronger impact- so really drink drink drink! If you are vomiting- try to mix in at least one powerade or gatorade among your water regimine to help replace vitamins. ANYWAYS lol enough with the water..
Like crispychewy said, find a program that your little one will like and keep it on 24/7. If you have baby gates to block of all hazardous areas, take a lil nap. 10-15 minute power naps in intervals will help you a lot. Give your little one something to do. My son (even though people think I am crazy for letting him play with this) uses my iPhone because I have downloaded applications like puzzles and animal pictures with noises and I am not kidding you- it can keep him entertained for hours! I also got him those crayola markers that only color on the crayola pages. It is a godsend. My son likes to draw on my walls with crayons, pens, markers, food anything he can. I just set it on the floor and let him color away without a worry. The markers do not show up on walls, couches, virtually anything but the designated paper. The trick is finding out what works for your little one. Lay on the couch and watch a movie with him. My son likes to cuddle.. well sometimes.. but he seems to get a little cuddlier now. I think kids have an intuition of mothers pregnancy and can sometimes be a lil more clingy.
Good luck hun! xx.