Luckily my twins (now 16 months) are not like this every day, but they do get like this when we can't go outside. I got a few active toys just for these times and store them in my garage or basement other times. We have a crawl through tube and rocking "shell" from Ikea. We got one of the smaller toddler slides. I also saved a bunch of (about 20) Formula containers and the kids open and close them, stuff things on them, bang on them, and build towers with them. These things really help to take care of the edge off their boredom.
Also my kids still don't let me read to them often, but I found some books that they will look at on their own. One is a cheap photo album that I filled with pictures of people they know. Otherwise they like books with lots of things going on in the picture.
Around this age my kids were making me crazy and I finally had to institute TV time. I had them watch a 20 minute video once a day to give me some time to do chores. I finally found one sign language video that seem to keep them riveted (at least for 10 minutes) called "My baby can sign" - its like magic. It might not work for your son though so I might try different educational videos your library has to offer. TV might not be the best thing for them, but a happy mommy is good for them too and they really did learn to sign.
I also find myself bored often. Any time you are doing the same thing day after day it happens, even if that thing is taking care of a wonderful little boy. Look at it this way the occasional frustration and boredom help you really appreciate the fun times and keep you from having 13 kids. If they were all fun 24/7 who would ever stop.
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