Most advice for exhausted parents is about the baby's sleep. This is about yours, on the assumption that the baby's sleep isn't up for discussion right now.
Chronic sleep deprivation is a physiological state with measurable effects. Treat it as a mood to push through and the second year gets a lot harder than it needs to be. I've done the first year four times and treated it as a mood at least three of them.
What it's doing to you
Read these as symptoms. That makes more difference than it sounds.
Emotional control goes first. The amygdala, the brain's alarm, fires harder while the brake works less well. Very small things set off very large reactions. Your sense of threat rises with it. Anxiety at three in the morning is partly a sleep symptom.
Working memory drops. Losing words, keys and the thread of a conversation is a symptom. Appetite shifts towards quick carbohydrate. That's hormones, not willpower. At the extremes, reaction time drops to something like alcohol impairment. That matters for driving.
Calling them symptoms helps. The other explanation on offer at 4am is that you've become a worse person. That explanation is wrong, and it does damage.
The shifts that recover the most sleep
Ranked by how much sleep they give back, which isn't the order most people try them in.
One protected stretch beats everything else. Four or five unbroken hours with someone else fully covering does more than eight broken ones. Two parents? Alternate whole nights. Both of you half-awake every night ruins two people for no gain.
Split the night by the clock. One covers until two and sleeps after. The other sleeps first and takes the rest. Each gets a real block. On the worst nights, go to bed absurdly early. Nine o'clock isn't a defeat. Sleep when the baby sleeps, sometimes, and leave the housework. Annoying advice, because you can't do it every day.
Nap for twenty minutes, not ninety. Short naps skip the deep-sleep grogginess. When someone offers help, ask them to hold the baby while you sleep. They'll offer to tidy your kitchen. Your kitchen is fine.
The sleep side of it
Getting more from the sleep you do get
Once the total hours are fixed, quality is the only lever left.
Dark room, cool room, same rules as the baby's. Get outside in the morning. Daylight anchors your body clock, and yours has taken as much of a beating as hers. Keep the phone out of night wakings. Scrolling at three costs you sleep on both sides of it.
Mind the caffeine curfew. Caffeine's half-life is around five hours, so the four o'clock coffee is still working at nine. Alcohol as a sleep aid backfires: you fall asleep faster, then the second half of the night is wrecked. Eat protein at breakfast. It flattens the mid-morning crash that pure carbohydrate brings.
Reduce the load
A surprising amount of what feels like tiredness is the sheer number of decisions. Anything you can turn into a default stops costing you.
Same breakfast every day. Same five dinners on rotation. Nobody in our house has complained. Repeat deliveries for nappies, wipes and staples. Clothes laid out the night before, for everyone. Lower the standard for the season and say so out loud, so it's a decision and not a failure. Cancel one recurring commitment outright. Trimming three achieves nothing, because all three creep back.
Safety, briefly and seriously
Don't drive when you're severely sleep-deprived. If you can't remember the last stretch of road, that was microsleep. It's in the same risk category as drink-driving.
Never fall asleep on a sofa or in an armchair holding a baby. It's the highest-risk sleep situation there is, and being comfortable is what gets people into trouble. If you're feeding at night and might doze, feed somewhere safe. I've dozed. Not sure anyone hasn't.
When tiredness isn't only tiredness
Ask for blood tests if the exhaustion is out of proportion to the sleep you're getting, or hasn't improved as the baby's has. Iron deficiency and thyroid changes after a birth are common. Both present as overwhelming fatigue. Both are easy to test for and treat.
Raise lasting low mood, anxiety or numbness alongside the tiredness too. Around one in ten fathers gets depressed in the first year, and it often shows up as irritability or working late. Say it out loud to someone qualified, however little you want to.
The ones people ask me
How do you cope with severe sleep deprivation as a parent?
Protect one unbroken stretch of four or five hours with someone else fully covering, and split the night into blocks instead of alternating wakings. Broken sleep totalling more hours is less restorative than a shorter unbroken block.
Is it safe to drive when sleep-deprived?
At the extremes, severe sleep deprivation slows reaction time about as much as alcohol does. If you can't recall the last stretch of road, that's microsleep. Don't drive when this tired. The risk isn't theoretical.
When should exhaustion be checked by a doctor?
If it's out of proportion to the sleep you're getting, or hasn't lifted as your baby's sleep improved. Iron deficiency and postnatal thyroid changes are both common, both cause overwhelming fatigue, and both are simple to test for.
This guide is general information, written to help you understand a topic and ask better questions. It is not medical advice and does not replace your own doctor, midwife or paediatrician. Anything that worries you about your baby belongs with them.