Either way, hypnic jerks are benign and nothing to worry about. The worst that can happen is probably an occasional kick

The TimeUTC element (line 284) is a string (in DynamoDB) and the incoming JSON already has it as standard ISO format so it can just be set directly like this. It is used as the Sort Key in this table, so having it in ISO format makes it properly sortable.

You see, when a monkey is unexpectedly soaring through the air, its muscles no longer have to prop it up and so they go limp. Confusingly, however, your muscles also go limp when you’re sleeping.

Either way, hypnic jerks are benign and nothing to worry about. The worst that can happen is probably an occasional kick against the shin of whoever is sharing the bed with you, which should be okay as long as you don’t wear steel-toe boots in bed.

So, when you drift off into sleep and your muscles relax a little too fast, your groggy brain sometimes misinterprets this for falling off a tree. As a result, your brain freaks out and triggers a reflex that startles you awake in an attempt to prepare for an imminent crash into the forest floor. Little does your brain know in its sleepy state that you no longer live on trees.

Now, the thing is that there is no single on/off switch in your body that inhibits all your motor neurons at once. Instead, the subsystems of your brain that handle sleep need to wrestle control from the subsystems that handle wakefulness. And sometimes, during this wrestling match, some motor neurons are fired randomly, causing your body to twitch.

A VTL foreach loop (line 279) is used to iterate over the incoming list of events, and map each one to a PutRequest. Note that the incoming events are just a simple JSON array/list of single level of attributes, but if they had nested elements, you’d just use this same dot syntax to traverse deeper as needed.

At this point, the subconscious part of your brain takes over. “Perfect,” it says, “time to boot up the dream images.” Your brain initiates the dream procedure and just when you’re about to nod off completely, it notices that all your muscles have suddenly and unexpectedly relaxed. “HOLY BANANA!” your brain screams panic-stricken, “Mayday! Mayday! We’re in freefall! Dammit! Wake up! Wake up! Shit, crap, poop! Brace for impaaaact!”

The user’s Cognito ID can be extracted from the $context.authorizer.cliams.sub element (line 283). But, as you can see, this is inserting additional data for DynamoDB that wasn’t part of the original HTTP request’s JSON, as well as showing how to get to the Cognito data.

Hypnic jerks are involuntary muscle contractions that occur during the transition from wakefulness to sleep. They’re most likely to occur if you’ve been gulping down too much coffee, have been stressed or sleep deprived, or did some vigorous exercise before going to bed. About 70% of people have experienced them. Even so, they are not well understood.

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I was driving to my friend’s house — a 35-year-old woman with no children (yet?) — and The Suburbs, by Arcade Fire, started playing on the radio. It’s a beautifully-written song, but it prompted bittersweet nostalgia of my ex and the way we used to dream of raising a family together. I turned up the volume and sang along to my favourite line:

One hypothesis considers them nothing more than a side effect of the process that replaces normal daytime motor control with sleep paralysis. The other considers them to be an archaic reflex we inherited from our tree-dwelling ancestors, who were at risk of falling off a branch while sleeping.

Lastly, a subtle one. Note the code #if($foreach.hasNext),#end(line 293). That’s a way to add the trailing comma in after each item in the batch of items for the DynamoDB request. Dynamo is particular though, and does not allow a comma after the last item, which is why we have this wrapped in the conditional (i.e. only add the comma if there will be more items after it). Without this, DynamoDB will fail your request.

As you’re probably aware, we humans descend from primates who lived and slept on trees. This means that we’ve inherited some monkey brain routines that no longer serve any purpose. Among them, according to the monkey-fall hypothesis, is a reflex that jolts you awake when you’re falling from a tree.

While not required, as mentioned early on, I am doing asynchronous post-processing of these incoming events. This is handled via DynamoDB’s streams. This setup involves a Lambda function that listens to the DynamoDB stream which provides all events from Dynamo (insert, delete, update, etc.). Thus, in my case, for this post-processing, you do need to filter to just INSERT events.

The rest of the elements are just a straight mapping from the incoming JSON to the value for the DynamoDB attribute. Note that of course you can have different names for the DynamoDB attributes vs. the JSON attributes, such as sensor_name gets stored as Sensor in DynamoDB.