How Simba Sleep drove a 57.6% jump in repeat buyers with lifecycle email and SMS

Simba Sleep, a UK mattress retailer, proved something every online retailer wants to know: the difference between a one-time buyer and a loyal customer is often just a message sent at the right time. In the final quarter of 2024, Simba Sleep saw nearly 60% more repeat orders after restructuring email and SMS to match when each customer was most likely to buy again. The shift wasn't about sending more mail. It was about sending the right mail to the right person when their need was real.

Lifecycle messaging turns customers into a revenue engine

The strategy behind Simba Sleep's jump is called lifecycle marketing. Instead of blasting every customer with the same offer whenever your calendar says to mail, you send different messages based on where each customer sits in their relationship with your brand. A customer who bought in March is in a different place than one who bought in October. A repeat buyer needs something different from someone who browsed but never checked out. Simba Sleep used email and SMS to reach each segment when the moment mattered most.

The payoff in Q4 was concrete: repeat orders climbed 57.6% compared to the previous quarter. That's not a one-off spike from a sale or a holiday push. It's a structural change in how the brand talks to customers, producing immediate, measurable revenue. For a mattress company, where a single order can be worth hundreds of pounds and repeat purchases happen years apart, the timing of every message is make-or-break.

What lifecycle messaging actually does

• Segments customers by when they last bought and what category they purchased from, so a pillow buyer gets a different message than a mattress buyer.
• Sends messages at moments when repeat purchases make sense, not when your inbox is full, but when the customer actually needs to replenish or upgrade.
• Uses email and SMS together, so customers see the offer across channels and at the frequency that works for retention, not just volume.
• Tracks lifecycle stage over time, so a one-time buyer moves into a repeat-buyer campaign only after they've proven loyalty.

The data that makes lifecycle work

Lifecycle marketing is only possible when you know three things about each customer: when they last bought, what they bought, and how often that category typically needs replenishment. A customer who purchased a mattress protector in February is more likely to be ready for an upgrade by August than a customer who bought a bed frame the same month. Simba Sleep's platform connected these signals across email and SMS, creating a flow where every message felt earned, not random.

The Q4 result suggests the retailer nailed the timing. A 57.6% jump in repeat orders in a single quarter isn't just higher email open rates or more clicks. It's more actual revenue. That's what happens when retention campaigns move past 'mail everyone' and into 'mail the right person when they're ready to listen.'

Simba Sleep improved its customer messaging with data-driven email and SMS, leading to a 57.6% increase in returning customers in the final quarter of 2024 versus Q3.

Klaviyo UK case study, February 2025

How to start with lifecycle messaging

You don't need massive scale to use Simba Sleep's approach. Start by segmenting your customer list by purchase date and category. Customers who bought three months ago get a different message than customers who bought six months ago. Customers who bought home goods get different timing than customers who bought accessories. Use email to introduce the idea and SMS to remind them when they're likely to be ready. Track which segments convert, then adjust the timing and message for each.

Simba Sleep's 57.6% increase in repeat customers in Q4 2024 shows that retention isn't about luck or luck alone. It's about knowing your customer's cycle, respecting it, and showing up with the right message when the moment is real. For any retailer selling products with predictable replenishment windows, lifecycle messaging is the difference between a customer who buys once and a customer who buys forever.