How Long Does a Lull Mattress Take To Inflate? What to Expect Step by Step

If you’ve just bought a new bed-in-a-box and are wondering “How Long Does a Lull Mattress Take To Inflate?”, you’re not alone. Many shoppers want to know when the mattress will reach full size, feel normal to sleep on, and be ready for regular use.

Below is a clear, FAQ-style guide to inflation time, what’s normal, and when you should be concerned.

How Long Does a Lull Mattress Take To Inflate?

Most compressed foam mattresses begin to expand as soon as the plastic wrap is cut. Typically, you can expect:

  • Initial expansion: within minutes to a few hours
  • Near full size: generally within 24–48 hours
  • Full feel and firmness: often within a couple of days, though subtle changes can continue for up to a week

So, when asking “How Long Does a Lull Mattress Take To Inflate”, the practical answer for most people is that it becomes sleepable the same day, but reaches its best, most consistent feel after about 24–48 hours.

Can You Sleep on It the First Night?

This is one of the most common follow-up questions.

In general, many users choose to sleep on a foam mattress the first night, even while it’s still finishing its expansion. However:

  • It may feel slightly softer, thinner, or uneven at first.
  • Corners and edges can take longer to fully puff up.
  • The comfort and support may change noticeably over the first couple of days.

If you want the mattress to feel as intended before judging comfort, it often helps to wait until it has had at least most of a day to expand.

What Affects How Fast It Inflates?

Several everyday factors can influence how long a Lull mattress takes to inflate:

Room Temperature

Foam tends to expand more easily in a moderate to warm room. Very cold environments can make the foam feel stiff and slow the process.

  • Warmer room = quicker, fuller expansion
  • Colder room = slower, firmer-feeling foam at first

Time in the Box

Mattresses that have been compressed for longer may need extra time to fully recover their shape. This doesn’t always cause problems, but it can mean:

  • Slightly more wrinkles or compression lines at first
  • A bit more patience before the mattress looks and feels uniform

Mattress Size and Layers

Thicker mattresses and those with multiple foam layers often:

  • Start expanding quickly
  • Take longer to completely settle into their final height and firmness

How Do You Know If It Has Fully Inflated?

You don’t need special tools. Use simple visual and feel-based checks:

  • Height: The mattress should be close to its stated height (for example, around 10–12 inches, depending on the model).
  • Corners: Corners and edges should look rounded and filled out, not sharply compressed or sunken.
  • Surface feel: Lying down, the surface should feel consistent across the entire bed, without obvious high or low spots.

If after 48–72 hours your mattress still looks severely uneven or clearly underinflated, that may indicate an issue that needs attention from the manufacturer’s support team.

Is It Normal for the Mattress to Change Over the First Week?

Yes. Even after you’re done asking “How Long Does a Lull Mattress Take To Inflate?”, it’s helpful to know that:

  • The foam can relax and adapt after you start sleeping on it.
  • The feel may become slightly softer or more responsive as air fully works into the materials.
  • Any remaining factory folds or slight surface ripples often smooth out with normal use.

This short “break-in” phase is common among foam mattresses and doesn’t usually mean something is wrong.

Tips to Help Your Mattress Inflate Properly

A few simple habits can support normal, healthy expansion:

  • Place it on a supportive base that matches the manufacturer’s recommendations.
  • Unbox it soon after delivery instead of letting it sit compressed for weeks.
  • Keep the room at a comfortable, stable temperature, avoiding extreme cold.
  • Give it space: remove extra plastic and bedding while it’s expanding so air can circulate.

✅ Quick Mattress Takeaways

Key points consumers should understand about “How Long Does a Lull Mattress Take To Inflate”

  • Initial inflation: Begins immediately after unboxing and unwrapping.
  • Usable timeframe: Many people find it okay to sleep on within hours, but performance may not be final.
  • Full expansion window: Plan for about 24–48 hours for the mattress to reach near-full size and feel.
  • Appearance checks: Look for even height, filled-out corners, and a smooth surface.
  • Normal variations: Temperature, time in the box, and mattress thickness can speed up or slow down the process.
  • When to be concerned: If it remains visibly underinflated or uneven after 2–3 days, it may warrant further guidance from customer support.

Understanding How Long Does a Lull Mattress Take To Inflate helps set realistic expectations. With a bit of patience in the first day or two, most users see their mattress reach its intended shape and feel, providing a stable foundation for everyday sleep.